diff --git a/web/pages/mxq/mxq.in b/web/pages/mxq/mxq.in
index 2356aea1..8a7bca74 100755
--- a/web/pages/mxq/mxq.in
+++ b/web/pages/mxq/mxq.in
@@ -647,7 +647,7 @@ sub group_table {
 			$q->td({class=>'number'},$job_threads),
 			$q->td({class=>'number'},size($job_memory*1000**2)),
 			$q->td({class=>'number'},days($job_time*60)),
-			$q->td({class=>'number'},size($job_tmpdir_size*1000*1000*1000)),
+			$q->td({class=>'number'}, $job_tmpdir_size ? size($job_tmpdir_size*1000*1000*1000) : '-'),
 			$q->td($q->a({href=>my_url('groups',{user_name=>$user_name})},$user_name)),
 			$q->td(group_status($group_status)),
 			$q->td({class=>'number'},$group_jobs),